Hole in crank case hose - The Unofficial BMW M5 Messageboard (m5board.com)

jrhaile · 19th August 2007, 19:23

Might seem like an obvious answer to the question, but the last couple of days I noticed my Beast to be kind of down on torque it seemed. I went to the track and it really ran bad. Best I could manage was a 13.7 when my previous best was a 13.2 and usually running 13.3 and 13.4 consistently. Anyways, when I was looking over my engine bay, I noticed a good sized hole in my crank case hose on the right cylinder head. I immediatly ordered a new one from the dealer. Is this by any chance the reason why my beast has been running like ***** lately?

bayerischemotor · 19th August 2007, 21:09

If it's the ventilation hose, then no. It won't affect perfomance. Try the MAFS.

jrhaile · 19th August 2007, 22:37

Quote:

Originally Posted by bayerischemotor

If it's the ventilation hose, then no. It won't affect perfomance. Try the MAFS.

it's this hose...

jaj · 20th August 2007, 03:45

First, replace both hoses. For $20 each there's no reason not to.

Second, it allows air into the intake without going through the MAF, so it could make the engine run "off" a bit.

Mine ran better when I replaced the hoses - they were soft and mushy but no visible holes.

jrhaile · 20th August 2007, 04:29

Quote:

Originally Posted by jaj

First, replace both hoses. For $20 each there's no reason not to.

Second, it allows air into the intake without going through the MAF, so it could make the engine run "off" a bit.

Mine ran better when I replaced the hoses - they were soft and mush but no visible holes.

yeah both of mine are kind of mushy... new hoses are on the way

bayerischemotor · 20th August 2007, 09:48

I had them both replaced because of holes in them aswell, but absolutely no difference in performance.

Neil.D · 13th February 2008, 12:18

Just replaced this myself, if anyone is interested it is PN 11.15.1.406.953

rassi · 13th February 2008, 13:48

Quote:

Originally Posted by Neil.D

Just replaced this myself, if anyone is interested it is PN 11.15.1.406.953

That's only the left one:
http://www.realoem.com/bmw/showparts...53&hg=11&fg=15

You need PN 11151406952 (left) and 11151406953 (right)

Neil.D · 13th February 2008, 13:50

Quote:

Originally Posted by rassi

That's only the left one:
http://www.realoem.com/bmw/showparts...53&hg=11&fg=15

You need PN 11151406952 (left) and 11151406953 (right)

Fair one.

thanks.

TopEnd · 13th February 2008, 13:55

Change it out. Run it. And report the results. Echoing the previous comments MAFs should be checked if the performance is still down.

blueaudis4 · 4th June 2008, 04:29

Can we get a stainless steel braided version for these hoses?

jks540i · 4th June 2008, 05:29

Any unmetered air entering the engine can fool the MAF's and cause the car to run rough. That's why it'll run like crap if the oil cap is loose.